Noun decade has 2 senses
  1. decade, decennary, decennium - a period of 10 years
    --1 is a kind of time period, period of time, period
    --1 is a part of century
    --1 has parts: year, twelvemonth, yr
    --1 has particulars:
     1900s; 1530s; twenties, 1920s; 1820s; thirties, 1930s; 1830s; forties, 1940s; 1840s; fifties, 1950s; 1850s; 1750s; sixties, 1960s; 1860s; 1760s; seventies, 1970s; 1870s; 1770s; eighties, 1980s; eighties, 1880s; 1780s; nineties, 1990s; nineties, 1890s; 1790s
  2. ten, 10, X, tenner, decade - the cardinal number that is the sum of nine and one; the base of the decimal system
    --2 is a kind of large integer